This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 120 |
| 2 | 7470 |
| 3 | 217144 |
| 4 | 4500818 |
| 5 | 85350934 |
| 6 | 1629022329 |
| 7 | 31770135236 |
| 8 | 629825651180 |
| 9 | 12620835427126 |
| 10 | 254719515611821 |
| 11 | 5165793380135728 |
| 12 | 105110696722615853 |
| 13 | 2143594088287821599 |
| 14 | 43784293043682987873 |
| 15 | 895295525455930993505 |